CN114054744B - Method for improving mechanical property of laser selective melting NiTi alloy - Google Patents

Method for improving mechanical property of laser selective melting NiTi alloy Download PDF

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CN114054744B
CN114054744B CN202111373369.3A CN202111373369A CN114054744B CN 114054744 B CN114054744 B CN 114054744B CN 202111373369 A CN202111373369 A CN 202111373369A CN 114054744 B CN114054744 B CN 114054744B
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powder
niti alloy
ceo
sample
laser
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CN114054744A (en
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于征磊
徐泽洲
郭云婷
刘宇霆
信仁龙
陈立新
刘瑞尧
李伦翔
李行
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Jilin University
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Jilin University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0433—Nickel- or cobalt-based alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

A method for improving the mechanical property of a laser selective melting NiTi alloy comprises the following steps: ceO with the particle size of 20-100 nm is mixed by a planetary powder mixer2Mixing the powder with NiTi alloy powder with the particle size of 15-53 mu m, wherein the powder mixing speed of a planetary powder mixer is 500r/min, and the powder mixing time is 3h; the mixed NiTi alloy powder and CeO2 powder are subjected to additive manufacturing through laser selective melting equipment to obtain the CeO-containing alloy powder2The NiTi alloy sample is characterized in that the laser power P of selective laser melting equipment is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 microns, and the layer thickness T is 30 microns; prepared to contain CeO2The surface of the NiTi alloy sample is pretreated and is polished by abrasive paper until the sample contains CeO2Removing an oxide layer on the surface of the NiTi alloy sample; rare earth CeO is mixed by planetary powder mixer2Mixing the nanometer powder with NiTi alloy powder, directly printing the sample by printing, and testing to obtain the final product containing CeO2The tensile property, the wear resistance and the corrosion resistance of the NiTi alloy sample are all improved.

Description

Method for improving mechanical property of laser selective melting NiTi alloy
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a method for improving the mechanical property of a laser selective melting NiTi alloy.
Background
As is well known, niTi alloy has special shape memory effect and super elasticity and is widely applied to biomedicineTherapy, aerospace, mechanical engineering and other fields. But the application range of the NiTi alloy is severely limited by the characteristic that the NiTi alloy is difficult to cut and process, and a new mode is provided for preparing a NiTi alloy complex structural part by the 3D printing technology. Although the 3D printing technology can be integrally formed to avoid secondary processing, the generated coarse columnar crystals can seriously influence the superelasticity and mechanical properties of the NiTi alloy. And also the surface properties such as corrosion resistance, frictional wear and the like are deteriorated. The rare earth element has the function of fine grain strengthening as a grain refiner, and the larger atomic radius of the rare earth element is added into the NiTi alloy to cause the lattice distortion of the NiTi alloy and generate secondary phase particles, thereby effectively improving the mechanical property of the NiTi alloy. Based on this, we considered that the nano-scale CeO is mixed by a planetary ball milling powder mixing process2Mixing the powder with micron-sized NiTi alloy gas atomized powder, printing and molding by a laser selective melting technology, researching and adding CeO with different contents2And (3) rules of influence on the mechanical property, the frictional wear property and the corrosion resistance of the NiTi alloy.
Disclosure of Invention
The invention aims to provide a novel mixed powder adding element CeO2The invention provides a method for improving the mechanical property of NiTi alloy, which solves the problems of poor mechanical property, insufficient corrosion resistance and friction resistance of the NiTi alloy melted in a laser selection area by adjusting CeO2The surface appearance after printing is observed through an optical microscope, and a tensile test is carried out through a universal tensile testing machine to compare the tensile property. And the friction performance and the corrosion performance of the sample are respectively detected through a friction and wear testing machine and an electrochemical workstation. The superior nanometer CeO is obtained by comparative analysis2The addition amount is as follows.
The purpose of the invention is realized by the following technical scheme:
a method for improving the mechanical property of a laser selective melting NiTi alloy comprises the following steps:
A. CeO with the particle size of 20-100 nm is mixed by a planetary powder mixer2Mixing the powder with NiTi alloy powder with the particle diameter of 15-53 mu m, wherein the powder mixing speed of the planetary powder mixer is 500r/min, and the powder mixing time is3h；
B. The NiTi alloy powder and CeO2 powder after being mixed are subjected to additive manufacturing through BLT-S210 laser selective melting (SLM) equipment to obtain the CeO-containing alloy powder2The NiTi alloy sample, wherein the laser power P of a Selective Laser Melting (SLM) device is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 μm, and the layer thickness T is 30 μm;
C. the CeO is contained in the product prepared in the step B2The surface of the NiTi alloy sample is pretreated by using 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper to be polished in sequence until CeO is contained2The oxide layer on the surface of the NiTi alloy sample is removed.
D. Furthermore, ceO is used in the first step2In an amount of CeO20.03 percent of the total mass of the powder and the NiTi alloy powder.
CeO content by optical microscopy2The surface appearance of the NiTi alloy sample is detected, and the frictional wear and the corrosion performance are detected; the tensile strength and the extensibility of the CeO are tested by a tensile test to obtain a proper CeO2The addition amount is added to effectively improve the tensile property of the NiTi alloy.
The invention has the beneficial effects that:
rare earth CeO is mixed by planetary powder mixer2Mixing the nanometer powder with NiTi alloy powder, directly printing the sample by printing, and testing to obtain the final product containing CeO2The tensile property, the wear resistance and the corrosion resistance of the NiTi alloy sample are all improved.
Drawings
FIG. 1 shows the addition of CeO in different amounts2The obtained CeO-containing2Comparative image under optical microscope of NiTi alloy sample.
FIG. 2 shows the addition of CeO in different amounts2The obtained CeO-containing2The tensile property curves of the NiTi alloy samples are compared.
FIG. 3 shows the addition of CeO in different amounts2The obtained CeO-containing2The friction coefficient curve and the wear profile of the NiTi alloy sample.
FIG. 4 shows the addition of CeO in different amounts2The obtained CeO-containing2Polarization plots of the NiTi alloy samples of (a).
Detailed Description
Example 1
A method for improving the mechanical property of a laser selective melting NiTi alloy comprises the following steps:
adding 0.03wt% of CeO with the particle size of 20-100 nm into the mixture A through a planetary powder mixer2Mixing the powder with NiTi alloy powder with the particle size of 15-53 mu m, wherein the powder mixing speed of a planetary powder mixer is 500r/min, and the powder mixing time is 3h;
B. the mixed NiTi alloy powder and CeO2 powder are subjected to additive manufacturing through BLT-S210 laser selective melting (SLM) equipment to obtain the CeO-containing alloy powder2The NiTi alloy sample, wherein the laser power P of a Selective Laser Melting (SLM) device is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 μm, and the layer thickness T is 30 μm;
C. the CeO is contained in the product prepared in the step B2The surface of the NiTi alloy sample is pretreated by using 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper to be polished in sequence until CeO is contained2The oxide layer on the surface of the NiTi alloy sample is removed.
The appearance is observed by a light mirror and is shown in figure 1b, and the mechanical property of the material of the universal tensile testing machine is adopted for testing. The test result shows that: example 1 containing CeO2The NiTi alloy sample has few surface morphology defects, and holes almost disappear. The tensile strength was 932.62MPa and the elongation was 12.27%. Meanwhile, the friction and wear performance is excellent, the friction coefficient can be reduced to about 0.12, and the depth of a grinding crack is about 23 mu m. Simultaneously has excellent corrosion resistance, and the corrosion current density can be reduced to 2.6432 multiplied by 10-9 A/cm2。
Example 2
A method for improving the mechanical property of a laser selective melting NiTi alloy comprises the following steps:
adding 0.3wt% of CeO with the particle size of 20-100 nm into the mixture A through a planetary powder mixer2Mixing the powder with NiTi alloy powder with particle diameter of 15-53 μm, and selecting a planetary powder mixer at a mixing speed of 500r/min during mixingThe time is 3h;
B. the mixed NiTi alloy powder and CeO2 powder are subjected to additive manufacturing through BLT-S210 laser selective melting (SLM) equipment to obtain the CeO-containing alloy powder2The NiTi alloy sample, wherein the laser power P of a Selective Laser Melting (SLM) device is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 μm, and the layer thickness T is 30 μm;
C. the CeO contained prepared in the step B2The surface of the NiTi alloy sample is pretreated by using 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper to be polished in sequence until CeO is contained2The oxide layer on the surface of the NiTi alloy sample is removed.
The appearance is observed by a light mirror as shown in figure 1c, and the mechanical property of the material of the universal tensile testing machine is adopted for testing. The test result shows that: in the embodiment 2, the surface appearance defects are increased, and the holes are increased. The tensile strength was 574.00MPa and the elongation was 7.75%. But the friction and wear performance is slightly improved, the friction coefficient can be reduced to about 0.35, and the depth of a grinding crack is about 27 mu m. Simultaneously has better corrosion resistance, and the corrosion current density can be reduced to 1.9534 multiplied by 10-8 A/cm2。
Example 3
A method for improving the mechanical property of a laser selective melting NiTi alloy comprises the following steps:
adding 3wt% of CeO with the particle size of 20-100 nm into the mixture A through a planetary powder mixer2Mixing the powder with NiTi alloy powder with the particle size of 15-53 mu m, wherein the powder mixing speed of a planetary powder mixer is 500r/min, and the powder mixing time is 3h;
B. the mixed NiTi alloy powder and CeO2 powder are subjected to additive manufacturing through BLT-S210 laser selective melting (SLM) equipment to obtain the CeO-containing alloy powder2The NiTi alloy sample, wherein the laser power P of a Selective Laser Melting (SLM) device is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 μm, and the layer thickness T is 30 μm;
C. the CeO is contained in the product prepared in the step B2The surface of the NiTi alloy sample is pretreated by sequentially polishing with 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper to contain CeO2The oxide layer on the surface of the NiTi alloy sample is removed.
The appearance is observed by a light mirror as shown in figure 1d, and the mechanical property of the material of the universal tensile testing machine is adopted for testing. The test result shows that: in this embodiment 3, the surface topography defects are further increased, and the holes are enlarged and further increased in number. The tensile strength was 495.05MPa, and the elongation was 2.39%. But the friction and wear performance is better, the friction coefficient can be reduced to about 0.22, and the depth of a grinding crack is about 26 mu m. Simultaneously has excellent corrosion resistance, and the corrosion current density can be reduced to 2.9156 multiplied by 10-8A/cm2。
Comparative example
The additive manufacturing NiTi alloy is prepared through BLT-S210 laser selective melting (SLM) equipment, wherein the laser power P is 125W, the scanning speed V is 600mm/S, the layer spacing H is 80 microns, and the layer thickness T is 30 microns. The prepared SLM-NiTi alloy surface is pretreated, and a surface oxidation layer is removed by sequentially polishing with 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper.
The appearance is observed by a light mirror and is shown in figure 1a, and the mechanical property of the material of the universal tensile testing machine is adopted for testing. The test result shows that: the surface appearance of the sample is good, the number of holes is small, the tensile strength is 735MPa, and the ductility is 10.88%. However, the frictional wear property was weak, the coefficient of friction was stabilized at about 0.7, and the depth of the wear scar was about 71 μm. The corrosion resistance is poor, and the corrosion current density is 4.4169 multiplied by 10-7 A/cm2。
By comparison, it can be found that CeO is added in different amounts2Will be applied to the modified CeO-containing2The mechanical properties of the NiTi alloy (CeO) have great influence2Too much addition results in severe deterioration of tensile properties, but CeO2The corrosion resistance and the wear resistance can be effectively improved by adding the titanium dioxide.
Wherein 0.03wt.% CeO2The addition of the (B) can effectively improve the mechanical property of the material and achieve the effects of strengthening and toughening. The highest tensile strength can reach 935MPa, and the elongation at break can reach 12.27%. Simultaneously has excellent wear resistance and corrosion resistance.The friction coefficient can be reduced to about 0.12, and the depth of the grinding mark is about 23 μm. Simultaneously, the corrosion current density can be reduced to 2.6432 x 10-9 A/cm2。

Claims (1)

1. A method for improving the mechanical property of a laser selective melting NiTi alloy is characterized in that: the method comprises the following steps:
A. CeO with the particle size of 20-100 nm is mixed by a planetary powder mixer2Mixing the powder with NiTi alloy powder with the particle size of 15-53 mu m, wherein the powder mixing speed of a planetary powder mixer is 500r/min, and the powder mixing time is 3h;
B. the mixed NiTi alloy powder and CeO2 powder are subjected to additive manufacturing through laser selective melting equipment to obtain the alloy powder containing CeO2The NiTi alloy sample of (1), wherein the laser power P of the selective laser melting equipment is 125W, the scanning speed V is 600mm/s, the interlayer spacing H is 80 μm, the layer thickness T is 30 μm, and CeO is added2In the amount of CeO20.03 percent of the total mass of the powder and the NiTi alloy powder;
C. the CeO is contained in the product prepared in the step B2The surface of the NiTi alloy sample is pretreated by using 400-mesh, 600-mesh, 800-mesh and 1200-mesh sandpaper to be polished in sequence until CeO is contained2The oxide layer on the surface of the NiTi alloy sample is removed.
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GB2475340B (en) * 2009-11-17 2013-03-27 Univ Limerick Nickel-titanium alloy and method of processing the alloy
JP6199897B2 (en) * 2012-01-18 2017-09-20 クック・メディカル・テクノロジーズ・リミテッド・ライアビリティ・カンパニーＣｏｏｋ Ｍｅｄｉｃａｌ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｌｌｃ Powder mixture for producing nickel-titanium-rare earth metal (Ni-Ti-RE) sintered alloys
CN103668186B (en) * 2013-12-19 2016-03-23 山东大学 A kind of titanium alloy laser melting coating surface reinforcing method
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CN112404454A (en) * 2020-10-28 2021-02-26 西北工业大学 Laser additive manufacturing method of NiTi alloy with large recoverable strain
CN113134627B (en) * 2021-04-20 2022-05-31 中国石油大学(北京) Selective laser melting processing method and application of high-nickel-rich NiTi alloy

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